Listmonk is fantastic -- I use it for the newsletter of my own blog and am amazed by how simple it was to set up and how easy it is to operate and use every time I send out a newsletter. Prior to Listmonk I used Mailtrain[0] and like Listmonk so much I want to run it as a service (with 30% donated back to the Listmonk project of course) -- deliverability worries and initial setup aside it's just the kind of... - Source: Hacker News / almost 3 years ago

Never tried but have a look at Mosaico and GrapesJS. Both are open-sourced and used by Mailtrain. Source: about 3 years ago

Another great solution that looks really nice (although harder to setup) is Winds https://getstream.io/winds/. Source: over 1 year ago

Winds by stream(https://getstream.io/winds/) is now shut down but I did enjoy using it to manage all my RSS feeds. Good thing it's open source been considering self hosting. - Source: Hacker News / over 1 year ago

So, I was looking for cool and open source/free RSS readers and found Winds, but I noticed that the GitHub repo said "This repository is no longer maintained; No further Issues or Pull Requests will be considered or approved" and now is completely archived. Source: over 2 years ago